Hilda, would this have been fixed as part of https://github.com/ManageIQ/manageiq-ui-classic/pull/142?  I tried reproducing it on master but couldn't.

Tzu-Mainn-Chen,

I was able to reproduce the bug on master (always),
but we have to correct steps to reproduce little bit (step 2).
For me, this is a bug, for sure.

Try this:
1. Navigate to Networks -> Networks -> Advanced search
2. Create this filter:

Field - Cloud Network: active
Check the checkbox "user will input the value".
Don't choose from the options true/false.
(It shouldn't be possible to have chosen one of true/false options and to have checkbox checked at the same time)

3. Click on 'Commit expression element changes' button
4. Click Apply button

Then I get the same error as mentioned here.
The error also occurs if you save the filter (clicking on "Save" button) after commiting and then click on "Apply" button or if you click on the filter from accordion (after saving it).

fixing https://github.com/ManageIQ/manageiq-ui-classic/pull/494

Verified in 5.8.0.11. Saving/applying this filter works and no exception is displayed.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2017:1367